How do you turn "a super tampon every 2 hours" into millilitres?

A super tampon absorbs about 9 mL (the FDA defines super as 9-12 grams; we use the consistent conversion the whole site is built on). Soaking one every 2 hours is about 4.5 mL per hour; over the window you need a pair to last - say a 8-hour day - that is roughly 36 mL of real capacity.

Why do brands’ "tampons’ worth" claims disagree?

Because brands count different tampons. The same "12 tampons’ worth" phrase means 60 mL at WUKA, which states 5 mL per tampon and states the 60 mL, and up to about 108 mL at Thinx, which states no millilitre figure at all (our computation at the FDA regular-tampon ceiling). That is why this site normalizes every claim to millilitres instead of tampon counts.

Is what I enter here private?

Yes, by architecture rather than promise: the conversion runs as code in your browser. Your flow description is never transmitted, never appears in a URL, and is stored only in your own browser so the tools can work together. One click clears it.

Do these tiers guarantee I won’t leak?

No. The numbers are each brand’s own published claims, normalized and graded for data quality - not independent lab tests. A 2023 study that tested period products with real blood measured far lower effective capacity for some products than marketing claims suggest. Treat the tiers as a fair comparison of claims, size up when between tiers, and plan a backup on flood days.

What absorbency do you actually need?

You shouldn't have to speak any brand's language. Describe your flow the way you'd say it out loud - “a super tampon every 2 hours” - and we'll convert it to real millilitres and name the tier that covers it in every brand.

Computed on your device - what you enter here is never sent to us.

Not sure how to describe your flow?

The full table shows what every brand's tier names actually hold, in millilitres, with a grade for how trustworthy each number is.

Compare every brand's absorbency Find my size in every brand

Common questions

How do you turn "a super tampon every 2 hours" into millilitres?: A super tampon absorbs about 9 mL (the FDA defines super as 9-12 grams; we use the consistent conversion the whole site is built on). Soaking one every 2 hours is about 4.5 mL per hour; over the window you need a pair to last - say a 8-hour day - that is roughly 36 mL of real capacity.
Why do brands’ "tampons’ worth" claims disagree?: Because brands count different tampons. The same "12 tampons’ worth" phrase means 60 mL at WUKA, which states 5 mL per tampon and states the 60 mL, and up to about 108 mL at Thinx, which states no millilitre figure at all (our computation at the FDA regular-tampon ceiling). That is why this site normalizes every claim to millilitres instead of tampon counts.
Is what I enter here private?: Yes, by architecture rather than promise: the conversion runs as code in your browser. Your flow description is never transmitted, never appears in a URL, and is stored only in your own browser so the tools can work together. One click clears it.
Do these tiers guarantee I won’t leak?: No. The numbers are each brand’s own published claims, normalized and graded for data quality - not independent lab tests. A 2023 study that tested period products with real blood measured far lower effective capacity for some products than marketing claims suggest. Treat the tiers as a fair comparison of claims, size up when between tiers, and plan a backup on flood days.

Every brand’s tiers in millilitres How we built the numbers